#!/usr/bin/env python

stack = []


def pushit():
    stack.append(input('Enter new string:').strip())


def popit():
    if len(stack) == 0:
        print('Can not pop from empty stack!')
    else:
        print('Removed [', stack.pop(), ']')


def viewstack():
    print(stack)


CMDS = {'u': pushit, 'o': popit, 'v': viewstack}


def showmenu():
    pr = '''
p(U)sh
p(O)p
(V)iew
(Q)uit

Enter choice: '''
    while True:
        try:
            choice = input(pr).strip()[0].lower()
        except:
            choice = 'q'
        print('\nYou picked: [%s]' % choice)
        if choice not in 'uovq':
            print('Invalid option, try again')
            continue
        if choice == 'q':
            break
        else:
            CMDS[choice]()


if __name__ == '__main__':
    showmenu()
